Device for holding or locking sandpaper on the rolls of floor-surfacing machines



LLS o 7 M. E. HELIN ET- AL navIcs. FOR HOLDING 0P. LOCKING SANDPAPER on THIS R0 v SURFAGING MACHINES 1178C! Feb. 28

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Patented Sept. 9, 1924.

UNITED s'rains 'PATE'NTJOFFICE.

MILTON E. HELIN AND HENRY R. HAWKINSON, OF CHICAGO, ILLINOIS.

DEVICE non HOLDING on LOCKING SANDIPAPER ON THE ROLLS or FLooR-sunFAoiNe MACHINES. i i

Application filed February floor surfacing machines, but has particular relation to means employed for holding or looking asheet of sand paper on the roll of such a machine, and it consists in certain peculiarities of the construction, novel arrangement and combination of the various parts thereof as will be hereinafter more fully set forthand specifically claimed.

As is well known to those skilled in the art to which our invention pertains, the sheets of sand paper or'abrading material which-are applied to the rollers of floor surr I responding parts throughout the different views of the drawing.

facing or dressing machines, soon become worn to suclran extent that they must be frequently removed from the rollers and new ones placed thereon.- This frequent removal and reapplication of the ,sheets of sand paper or abrasive material, requires considerable time and skill when the appliances for holding the sheets of paper on the rollers are of the type. or construction heretofore in general use, besides being tedious and unsatisfactory.

The principal object of our invention is to provide a very simple and inexpensive locking andholding device for sand paper on a roller for sand papering or floor surfacing machine, by means of which sheets of sand paper or the like can be quickly. secured in operative position on the roller and readily removed therefrom without the employment of undue skill.

Other objects and advantages of theinvention will be disclosed inthe following description and explanation.

The invention will be explained and more readily understood when read in conjunction with the accompanying drawing which illustrates an embodiment of which the invention is susceptible, it being understood that various modifications may be resorted to without departing from the spirit of the 28, 1923. Serial No. 621,746.

invention, so long as they fall within the scope-of the appended claims forming apart hereof.

In the draw1ng,- V A v v Fig. 1 1s a view n side elevation of a roller of a floor surfacing machinewith a sheet of sand paper or abrasive material applied thereto and held in positionby our improved device.

Fig. 2 is an end view thereof showing about the positions of the devicewli'en the edges of the sand paper are being initially engaged therewith. i

Fig. showing the positions of the device when the sand paper is locked thereby on theroller.

Fig. 4c is a fragmental cross-sectional view showing the parts in similar positions to that shown in Fig. i j i I Fig. 5 is a longitudinally sectional view taken on line 5'-5 of Fig. 1 looking in the direction indicated by the arrows, and

0 ma .fragmental view ofthe roller 5 Fig. 6 is a detached view of the paper clamping members of the device.

Inke numerals of reference refer to cor- The. roller on which the sand paper is mounted and securely held by our improved sections 9 and 10 of the roller isjprovided with a head 14, each. of which is by preference provided with an inwardly extended. hubf'15 in which the axle or shaft 16 of the roller is located. ,Theroller is fixed to the shaft16 by meansof a: pin 17 extended through suitableopenings in one of the h'ubs 15an d a registering opening in; said shaft.

In its periphery the hollow roller is provided [with a diagonally disposed slot 18 which extends through each end of the roller and communicates with the I cavity thereof andis employed to permit the end portions ofthe sheet 19 of sand paper or abrasive material to be inserted into the roller, and between the clamping members of the locking device. Near the inner edge of the slot 18 each of the heads 14 of the roller is provided with a circular opening 20, which openings provide bearings for the ends of the clamping members 21 and 22, which as is clearly shown in Fig. 6 of the drawing, are segmental in cross-section and when assembled or located in said bearings, are held slightly apart at one of the edges of their meeting surfaces by means of a screw or projection 23 mounted on the straight face of one of the clamping members and having a head to contact with the straight face of the other clamping member, all of which will be clearly understood by reference to Fig. 6 of the drawing.

This spacing member 23 is so located as to be out of the path of the sheet of sand paper whenv its ends are inserted in theslot 18 and between the clamping members 21 and 22 and to accomplish this, the said spacing member is located on and near one of theends of the clamping member. As is clearly shown in Fig. 5, the portions of the clamping members 21 and 22 located in the bearing openings 20, are reduced and rounded so as to turn easily in said bearings. One of the clamping members, preferably the one indicated by the reference numeral 21, is provided at one of its ends with a longitudinal extension 24- which is angular in cross-section so as to be easily engaged by a wrench.

Mounted on the extension 24 so as to turn therewith, is a ratchet toothed plate or rack 25, the teeth of which are adapted to be engaged by a pawl 26 pivotally mounted on the head 14 of the roller adjacent said. rack. This pawl ,is actuated by a spring 27 which engages at. one of its ends the pawl 26 between its pivotand therack 25, and is then coiled around the pivot of the pawl and has its other end secured to a pin or projection 28 on the head 14- of the roller adjacent the rack. By this arrange ment it is manifest that by turning the clamping member 21 by means of a wrench applied to the extension 2 1, or otherwise, in

the direction of the pawl, the hook thereof will pass over the ratchet teeth of the rack until sutficient turning movement of the clamping members to tighten the sand paper on the roller has been accomplished when it is obvious the pawl will engage the rack so as to lock and hold it in the proper position for maintaining the sand paper in close contact with the roller, it being understood that the end edges of the sheet of sand paper shall have been inserted through the slot 18 and into the space 29 between the clamping members 21 and 22 before the said members are turned, or while the parts are in about the positions shown in Fig. 2 of the drawing. The roller 8 is as usual, provided on its periphery with. a lining 30 of felt, which may be secured to the roller 'oy means of screws 31 employed in the usual manner. The sheet of sand paper 19 is lo cated on the outer surface of the felt lining and for the purpose of facilitating its ends to e inserted through the slot, has its side edges near its ends inwardly inclined as shown at 32 in Fig; 5 of the drawing,

From the foregoing and by reference to the drawing, it will be readily understood and clearly seen that, assuming it is desired to place a sheet of sand paper on the peripheral lining 30 of the roller, and that the clamping members 21 andi22 are disposed in about the positions shown in Figs.

2 and 6 of the drawings, it is manifest that by placing a sheet,of sand paper on the roller and inserting its ends into the slot 18, said ends will be guided thereby and enter the space 29 between the clamping members 21 and 22, when by forcing the ends of the v sand paper into the lower part of said space they will be in position to be gripped by the clamping members, when by turning said members to about the positions shown in Figs. 3 and t of the drawing, the paper will be tightened on the roller and securely held in such position by reason of the engagernent of the pawl 26 with the teeth of the rack 25 until it is desired to remove the sand paper for replacement, which may be done by releasing the pawl from the rack,

when it is obvious the clamping members can be turned to their 1n1t1al positions shown 1n Figs. 2 and 6 of the drawing.

lVhile we have shown the slot 18 extended SP entirely through the ends of the roller, yet

it is manifest that this is not absolutely essential, as the ends of "the slot may termi' nate at about the inner surface of the heads of the roller or short thereof.

By reference to Fig. 6 of the drawing, it

will be seen that the spacing member 23 on the member 22 is located nearer the upper edge of said member than its lower edge and that the spacing member is rounded. This location of the spacing member and its construction affords a teetering pointor pivot between the members 21. and 22 to the end that said members, when positioned for receiving the ends of the sandpaper 19,- will be more widely separated at their;upper edges than their lower ones, as shown in Fig.6, thus insuring easy and accurate insertion of the ends of the sandpaper. Besides, this construction and arrangement permits the lower edges'of the members 21 and 22 to be separated by the insertion of, V

Having thus fully described our invention, what we claim as new and desire to secure by Letters Patent is 1. In a device of the class described, the combination with a roller having a slot in its periphery and a bearing opening in each of its ends near said slot, of apair of spaced clamping members journaled at their ends in said openings, said members having their adjacent surfaces straight, a spacing member supported by one of said clamping members and located in the space between said members for holding them at one of the edges of their straight surfaces apart, and means on one of said members for turning the pair of members.

2. In a device of the class described, the combination with aroller having a slot in its periphery and a bearing opening in each of its ends near said slot, of a pair of spaced clamping members journaledat their ends in said openings, said members having their adjacent surfaces straight, a spacingv member supported by one of said clamping members and located in the space between said members for holding them at one of the edges of their straight surfaces apart, means on one of said members for turning the pair of members, and means to lock them in their turned position.

3. In a device of the class described, the combination with a roller having a slot in its periphery and a bearing opening in each of its ends near said slot, of a pair of spaced clamping members journaled at their ends in said openings, said members being of segmental shape in cross-section and presenting their flat surfaces towards each other,

a spacing member supported by one of said clamping members and located in the space between said members for holding them at one of the edges of their adjacentsurfaces" apart, a longitudinal extension on the end or one of said members adapted to be engaged by an instrument for turning said member, a rack mounted on said extension to turn therewith, and a spring actuated pawl pivotally mounted on one end of the roller for engagement, with said rack.

MILTON E. HELIN. HENRY R. HAWmNsoN. 

